JP2002298409A - Optical disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk unit provided with a dustproof shutter in which the opening area of an decorative laminate is narrowed. SOLUTION: A shutter 26 is rotatably placed at the base 12 instead of attaching the shutter 26 to a slidable pickup 18 as conventional. The opening area of the opening part 41 of a decorative laminate 40 can be narrowed than heretofore because the opening part 41 is limited only to a slide area corresponding to the slide of an objective lens 24, the rotation area of a shutter 26, and an area corresponding to a turntable 16. Accordingly, occasions for dust or the like to intrude from the opening part 41 of the decorative laminate 40, and adhere to a driving means, electronic parts connected to the pickup 18, a printed circuit board or the like are reduced than before. Moreover, visual effects are improved because a visual recognition area to visually recognize the components of the driving means or the like from the opening part 41 of the decorative laminate 40 is narrowed than before.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reproducing information recorded on an optical disk such as a compact disk with an optical pickup having an objective lens.

[0002]

2. Description of the Related Art In an optical disk apparatus, a pickup for irradiating an optical disk with laser light is slidably disposed. The pickup is provided with an objective lens for converging laser light. Since the objective lens needs to be arranged so that laser light can be emitted to the disk,
The pickup is arranged in an open state on the side facing the disk.

[0003] That is, the objective lens is in an environment where dust and dust floating in the atmosphere (hereinafter referred to as "dust") are liable to adhere to the objective lens. The amount of light and the amount of light reflected from the disk is reduced, which causes a reading failure (reproduction failure) of a photodetector that detects a signal from the reflected light.

For this reason, some conventional disk devices include:
As shown in FIGS. 6 to 8, some have a dustproof mechanism for preventing dust from adhering to the objective lens. A disk device having a dustproof mechanism is mounted on a base (not shown)
A turntable 80 on which a disc (not shown) is placed,
And a pickup 82 that slides along the radial direction of the turntable 80.

[0005] A clamper (not shown) is movably arranged at a portion facing the turntable 80.
A disc (not shown) is chucked (held) by the clamper and the turntable 80. The pickup 82 includes a rack 83 disposed on the pickup 82,
It is driven via driving means (including a motor (not shown)) such as a pinion 84 which always meshes with the rack 83.

The pickup 82 has an opening 82A (indicated by a broken line in FIG. 6) for emitting a laser beam, and an objective lens 86 (in FIG. 6, a broken line) in a portion corresponding to the opening 82A. Is shown). In the pickup 82, a shutter 88 for opening and closing the objective lens 86 (that is, the opening 82A) is rotatably disposed via a support shaft 90. That is, the shutter 88
Is rotated about the support shaft 90, so that the opening 8
2A (objective lens 86)
Release 6.

On a base (not shown), a decorative plate 96 is disposed so as to be located on the same plane as the shutter 88. The decorative plate 96 is formed with an opening 97 over a range in which the turntable 80 and the pickup 82 move.

The pickup 82 and the shutter 88 are formed with hooks 82B and 88A.
A coil spring 92 is hooked on 2B and 88A. The shutter 88 is constantly urged in the counterclockwise direction (the direction of the arrow in FIG. 8) by the urging force of the coil spring 92. That is, as shown in FIG. 8, the shutter 88 opens the objective lens 86 by the urging force of the coil spring 92.

As shown in FIG. 6, the shutter 88 has an engaging portion 89A at the base end on the support shaft 90 side. On the other hand, a pickup 8
The stopper 94 is arranged so as to face the engaging portion 89A of the shutter 88 in a state in which the shutter 2 stops at the standby position (stop mode). In the stop mode in which the engaging portion 89A contacts the stopper 94, the shutter 8
8 rotates toward the objective lens 86 against the urging force of the coil spring 92 to close the objective lens 86.

As shown in FIG. 7, a guide claw 89B is formed at the other end of the shutter 88.
A guide rail 82C is formed at a position of the pickup 82 corresponding to 9B. The guide rails 82C and the guide claws 89B guide the shutter 88 so that it can rotate smoothly and reliably, and also prevent the shutter 88 from rising from the upper surface of the pickup 82.

As shown in FIG. 6, in the stop mode,
Since the engaging portion 89A comes into contact with the stopper 94, the shutter 88 closes the objective lens 86 against the urging force of the coil spring 92. That is, since the objective lens 86 is closed by the shutter 88, the adhesion of dust is prevented.

On the other hand, as shown by an imaginary line in FIG.
Since the shutter 9A is separated from the stopper 94, the shutter 88 is rotated counterclockwise by the urging force of the coil spring 92 to open the objective lens 86. That is, the objective lens 8
Since the disk 6 is opened, the information on the disk can be read by the irradiated laser light.

[0013]

In the prior art shown in FIG. 6, the decorative plate 96 is located on the same plane as the shutter 88, and the shutter 88 is attached to the pickup 82. It is necessary to provide a substantially rectangular opening 97 in the decorative plate 96 over the range in which the moving member moves (see FIGS. 6 and 8).

For this reason, dust and the like are formed in the opening 9 of the decorative plate 96.
7, there is a greater chance of adhering to the drive means, electronic components connected to the pickup 82, printed circuit boards, and the like. Further, the parts of the driving means and the like can be visually recognized from the opening 97 of the decorative plate 96, so that the appearance is poor.

In view of the above circumstances, the present invention provides an optical disk device having a dustproof shutter, in which an opening area of a decorative plate is narrowed.

[0016]

According to the present invention, there is provided an optical pickup having an objective lens and slidably disposed in a radial direction with respect to a turntable, and movably disposed on a base, wherein the optical pickup is in a standby position. A shutter that closes the objective lens when the optical pickup is stopped, and opens the objective lens when the optical pickup slides from a standby position; and a shutter that is located on the same surface as the shutter and opens and closes. And a decorative plate forming an opening corresponding to an opening / closing area and a slide area in which the objective lens slides.

In the present invention, the shutter is not rotatably mounted on the sliding pickup, but is rotatably disposed on the base, so that the opening area of the opening of the decorative plate can be minimized. it can.

That is, according to the present invention, the chance that dust and the like enter from the opening of the decorative plate and adhere to the driving means, the electronic components connected to the pickup, the printed circuit board, and the like is reduced as compared with the related art. Further, according to the present invention, the visible area in which the parts of the driving means can be visually recognized from the opening of the decorative board becomes narrower than before, so that the appearance is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An optical disk device according to an embodiment of the present invention will be described. FIG. 1 is a plan view showing a main part of the optical disk device of the present embodiment, and FIG. 2 is a side view of FIG.

As shown in FIG. 2, the optical disk device 10
Is provided with a turntable 16 on which an optical disk (indicated by an imaginary line in FIG. 2) 14 is placed, and a pickup 18 which slides along the radial direction of the turntable 16.

A clamper (not shown) is movably arranged at a position facing the turntable 16.
The disk 14 is chucked (held) by the clamper and the turntable 16. Also, as shown in FIG.
The pickup 18 is driven via a rack 20 arranged on the pickup 18 and driving means (including a motor (not shown)) such as a pinion 22 which always meshes with the rack 20.

The pickup 18 has an opening 18A (indicated by a broken line in FIGS. 1 and 2) for emitting a laser beam, and an objective lens 24 (FIGS. 1 and 2) at a portion corresponding to the opening 18A. 2 (indicated by a broken line in FIG. 2).

(Configuration of shutter opening / closing mechanism) FIG. 2
As shown in (1), a shutter 26 for opening and closing the objective lens 24 (that is, the opening 18A) is rotatably disposed on the base 12 via a support shaft 28 erected on the base 12. That is, the shutter 26 covers the opening 18A (the objective lens 24) and opens the objective lens 24 by rotating about the support shaft 28.

As shown in FIG. 1, the shutter 26 has a substantially U-shape in plan view, and is integrally formed with a flat shutter portion 27 and a base portion 28. As shown in FIG. 2, the shutter portion 27 and the base portion 28 are stepped, and the base portion 28 is smaller than the shutter portion 27 in the base 1.
It is descending toward two sides. This is to allow the base 28 to escape from the decorative board 40 described later.

As shown in FIG. 5, a cylindrical bearing 28A is formed on the base 28, and the bearing 28A is inserted into the bearing 30B of the support shaft 30. Bearing 30B
Is formed from substantially the middle of the support shaft 30 toward the tip thereof, and has a diameter slightly smaller than the base 30A of the support shaft 30.

The shutter 26 has a bearing 28
A is rotatably attached to a bearing 30B of the support shaft 30 via a washer 31 and a screw 32. The inner peripheral surface of the bearing 28A of the shutter 26 and the support shaft 30
Between the outer peripheral surface of the bearing portion 30B
GA is preset so that it can be performed.

An engaging portion 29 extends from the base portion 28 toward the base 12, and the planar shape of the engaging portion 29 is substantially arc-shaped (see FIG. 1). The tip 29A of the engaging portion 29 is connected to the bearing 28A of the shutter 26 and the support shaft 3.
0 is located closer to the base 12 than the bearing 30B.
That is, the distal end 29 </ b> A of the engaging portion 29 is connected to the base 30 of the support shaft 30.
A.

On the other hand, the pickup 18 has
9 is arranged so as to correspond to the front end 29A of the engaging portion 29 of the shutter 26. When the engaging projection 19 presses the tip 29A of the shutter 26, the shutter 26 is rotated as shown in FIG. 1 and the shutter 26 is tilted toward the upper surface 18B of the pickup 18 as shown in FIG. 5A ( Move).

That is, in the present embodiment, the bearing 28
A gap GA is provided between the inner peripheral surface of the shaft A and the outer peripheral surface of the bearing portion 30B of the support shaft 30, and the engagement protrusion 19 of the pickup 18 is provided.
The position at which the end of the shutter 26 abuts on the bearing 28A of the shutter 26 and the bearing 30B of the support shaft 30
Rather than the base 12 side (lower side).
When the shutter 9 presses the front end 29A of the shutter 26, the shutter 26 tilts toward the upper surface 18B of the pickup 18.

As shown in FIGS. 1 and 2, the base 12
A helix coil spring (hereinafter, simply referred to as “spring”) 38 for urging the shutter 26 is disposed on the upper side.
The spring 38 includes a coil portion 38A and a pair of leg portions 38B and 38C.

The spring 38 has its coil portion 38A inserted and attached to the support portion 36 erected on the base 12. The leg 38B of the spring 38 is hooked on a hook 28B formed on the base 28 of the shutter 26, and the leg 38C of the spring 38 is hooked on a pin receiving portion 34 erected on the base 12. Here, as shown in FIG. 5B, the contact (hook) position between the leg portion 38B of the spring 38 and the hook portion 28B of the shutter 26 is within the range of the height position of the bearing portion 28A.

The shutter 26 is always urged in the counterclockwise direction (the direction of the arrow in FIG. 3) by the urging force of the leg 38B of the spring 38. That is, as shown in FIG. 3, the shutter 26 opens the objective lens 24 by the urging force of the leg 38B of the spring 38.

On the other hand, the pickup 18 is shown in FIGS.
In the state (stop mode) where the shutter 26 stops at the standby position (stop position) shown in FIG.
9A is pressed by the engagement projection 19 of the pickup 18, the shutter 26 rotates clockwise against the urging force of the leg 38B of the spring 38, and closes the objective lens 24.

As shown in FIG. 4, when the shutter 26 rotates counterclockwise to open the objective lens 24 (see FIGS. 3 and 4), the rotation of the shutter 26 is moved to a predetermined position on the base 12. Stopper 46 stopped by
Are located.

In the stopper 46, a slit 47 is formed at a position corresponding to the height of the shutter 26. The slit 47 is used to position the shutter 26 at a predetermined height, and to prevent the shutter 26 from abutting on the upper surface 18B of the pickup 18 due to bending of the shutter 26.

The stopper 46 is connected to the pickup 18
During the slide (i.e., during play), the shutter 26 is retracted from the objective lens 24 of the pickup 18, and is arranged at a position where reading of the information on the disk 14 is not prevented.

As shown in FIG. 1, a decorative plate 40 is attached to the base 12 via a support portion 42 and a screw 44 so as to be located on the same plane as the shutter portion 27 of the shutter 26. The decorative plate 40 has an opening 41 for allowing the turntable 16 and the like to escape.

That is, the opening 41 corresponds to a portion corresponding to the objective lens 24, a portion in the rotation range where the shutter 26 rotates, and a portion in the range from the standby position of the pickup 18 shown in FIG. 1 to the slide completion position shown in FIG. A portion in a range corresponding to the turntable 16 is opened (notched) so as to be continuous.

In this embodiment, the shutter 26 is
Instead of being mounted on the slidable pickup 18 as in the prior art, it is disposed on the base 12 so as to be rotatable (movable), so that the opening area of the opening 41 can be minimized.

According to the present embodiment, the opening 41 of the decorative board 40 can be limited to only the sliding area corresponding to the sliding of the objective lens 24, the rotating area of the shutter 26, and the corresponding area of the turntable 16. In addition, the opening area of the opening 41 of the decorative board 40 can be made narrower than before. In particular, in the stop mode, as shown in FIG.
8B and the shutter 26.

That is, according to the present embodiment, the chance that dust or the like enters through the opening 41 of the decorative plate 40 and adheres to the driving means, the electronic components connected to the pickup 18, the printed circuit board, etc., is higher than in the prior art. Less. Further, according to the present embodiment, the visible area in which the components of the driving means and the like can be visually recognized from the opening 41 of the decorative board 40 is narrower than in the related art, so that the appearance is improved.

Next, the operation of the present embodiment will be described. First, as shown in FIGS. 1, 2 and 5A, in the stop mode, the leading end 29 of the engaging portion 29 of the shutter 26 is moved.
When A is pressed by the engagement projection 19 of the pickup 18, the shutter 26 rotates clockwise against the urging force of the leg 38B of the spring 38, and closes the objective lens 24. That is, since the objective lens 24 is closed by the shutter 26, dust is prevented from adhering.

In this embodiment, the bearing 28
A gap GA is provided between the inner peripheral surface of the shaft A and the outer peripheral surface of the bearing portion 30B of the support shaft 30, and the engagement protrusion 19 of the pickup 18 is provided.
The position at which the end of the shutter 26 abuts on the bearing 28A of the shutter 26 and the bearing 30B of the support shaft 30
The shutter 26 tilts toward the upper surface 18 </ b> B of the pickup 18 when the engaging projection 19 presses the tip 29 </ b> A of the shutter 26.

That is, according to the present embodiment, as shown in FIGS.
To the objective lens 24 of the pickup 18 (opening 18A)
Is forcibly moved to the upper surface 18B side where is located, so that the opening 18A is covered and concealed so that there is no gap between the shutter 26 and the upper surface 18B of the pickup 18 due to the bending of the shutter 26.

Therefore, according to the present embodiment, the shutter 2
6 is the upper surface 18 where the opening 18A of the pickup 18 is located
The urging and close contact with the B side prevents dust from entering the opening 18A, thereby more reliably preventing dust from adhering to the objective lens 24.

On the other hand, as shown in FIGS. 3, 4, and 5B, in the play mode in which the pickup 18 slides, the tip 29A of the engaging portion 29 of the shutter 26 separates from the engaging projection 19 of the pickup 18. So shutter 2
6 rotates counterclockwise by the urging force of the leg 38B of the spring 38 to open the objective lens 24. That is, since the objective lens 24 is opened, the information on the disk 14 (see the imaginary lines in FIGS. 2 and 4) can be read by the emitted laser light.

When the engaging projection 19 is separated from the distal end 29A of the shutter 26, the contact position between the leg 38B of the spring 38 and the hook 28B of the shutter 26 falls within the range of the height of the bearing 28A. In addition, the shutter portion 27 is in a state parallel to the upper surface 18B of the pickup 18 due to the urging force of the leg portion 38B.

That is, in this embodiment, the shutter 2
6, since the inner peripheral surface of the bearing 28A and the outer peripheral surface of the bearing 30B of the support shaft 30 abut tangentially along the radial direction, the shutter 27 is held in a parallel state. Further, the shutter 26 rotated counterclockwise is fitted into a slit 47 of a stopper 46 arranged at a predetermined position and positioned.

In the above embodiment, the stopper 46 is provided as a means for positioning the shutter 26 at a predetermined position. However, in the present invention, the pin receiving portion 3 is provided without the stopper.
4 may also be used as a stopper, or the side surface of the opening 41 of the decorative board 40 may be used as a stopper. Further, in the present invention, the movement of the shutter is a concept including a slide and the like in addition to the rotation.

The disc according to the present invention is a concept including a compact disc, a digital video disc (DVD) and the like. Further, the optical disc device according to the present invention includes a disc changer, a portable disc player,
The same applies to a personal computer or the like.

[0051]

As described above, according to the present invention,
Since the shutter is not rotatably mounted on the pickup that slides as in the related art, but is rotatably disposed on the base, the opening area of the opening of the decorative plate can be minimized.

That is, according to the present invention, the chance that dust and the like enter through the opening of the decorative plate and adhere to the driving means, the electronic components connected to the pickup, the printed circuit board, and the like is reduced as compared with the related art. Further, according to the present invention, the visible area in which the parts of the driving means can be visually recognized from the opening of the decorative board becomes narrower than before, so that the appearance is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a part of the optical disk device shown in FIG.

FIG. 3 is a plan view showing a state where the pickup shown in FIG. 1 slides and a shutter rotates.

FIG. 4 is a sectional view of a part of the optical disk device shown in FIG.

5 is a cross-sectional view of a main part of the configuration related to the support shaft shown in FIG.

FIG. 6 is a plan view showing a main part of an optical disk device according to a conventional example.

FIG. 7 is a perspective view of a main part of a shutter opening / closing mechanism mounted on the pickup shown in FIG. 6;

FIG. 8 is a plan view showing a state where the pickup shown in FIG. 6 slides and a shutter rotates.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Optical disk drive 12 Base 14 Optical disk 16 Turntable 18 Pickup 24 Objective lens 26 Shutter 40 Decorative plate 41 Decorative plate opening

Claims (1)

[Claims] An optical pickup provided with an objective lens and slidable in a radial direction with respect to a turntable; and an optical pickup movably disposed on a base, wherein the optical pickup is stopped at a standby position. A shutter for closing the objective lens and opening the objective lens when the optical pickup slides from a standby position; and an opening / closing area which is located on the same surface as the shutter, where the shutter opens and closes, and the objective lens slides. And a decorative plate forming an opening corresponding to the slide area to be moved.